142 lines
2.5 KiB
JavaScript
142 lines
2.5 KiB
JavaScript
var from = require('..')
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var spec = require('stream-spec')
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var a = require('assertions')
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function read(stream, callback) {
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var actual = []
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stream.on('data', function (data) {
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actual.push(data)
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})
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stream.once('end', function () {
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callback(null, actual)
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})
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stream.once('error', function (err) {
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callback(err)
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})
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}
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function pause(stream) {
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stream.on('data', function () {
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if(Math.random() > 0.1) return
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stream.pause()
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process.nextTick(function () {
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stream.resume()
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})
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})
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}
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exports['inc'] = function (test) {
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var fs = from(function (i) {
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this.emit('data', i)
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if(i >= 99)
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return this.emit('end')
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return true
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})
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spec(fs).readable().validateOnExit()
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read(fs, function (err, arr) {
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test.equal(arr.length, 100)
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test.done()
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})
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}
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exports['simple'] = function (test) {
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var l = 1000
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, expected = []
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while(l--) expected.push(l * Math.random())
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var t = from(expected.slice())
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spec(t)
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.readable()
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.pausable({strict: true})
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.validateOnExit()
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read(t, function (err, actual) {
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if(err) test.error(err) //fail
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a.deepEqual(actual, expected)
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test.done()
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})
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}
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exports['simple pausable'] = function (test) {
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var l = 1000
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, expected = []
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while(l--) expected.push(l * Math.random())
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var t = from(expected.slice())
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spec(t)
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.readable()
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.pausable({strict: true})
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.validateOnExit()
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pause(t)
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read(t, function (err, actual) {
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if(err) test.error(err) //fail
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a.deepEqual(actual, expected)
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test.done()
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})
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}
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exports['simple (not strictly pausable) setTimeout'] = function (test) {
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var l = 10
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, expected = []
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while(l--) expected.push(l * Math.random())
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var _expected = expected.slice()
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var t = from(function (i, n) {
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var self = this
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setTimeout(function () {
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if(_expected.length)
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self.emit('data', _expected.shift())
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else
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self.emit('end')
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n()
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}, 3)
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})
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/*
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using from in this way will not be strictly pausable.
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it could be extended to buffer outputs, but I think a better
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way would be to use a PauseStream that implements strict pause.
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*/
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spec(t)
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.readable()
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.pausable({strict: false })
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.validateOnExit()
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//pause(t)
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var paused = false
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var i = setInterval(function () {
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if(!paused) t.pause()
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else t.resume()
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paused = !paused
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}, 2)
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t.on('end', function () {
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clearInterval(i)
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})
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read(t, function (err, actual) {
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if(err) test.error(err) //fail
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a.deepEqual(actual, expected)
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test.done()
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})
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}
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